But you will exceed the rate limit, if you get unmodded at, for example, 70 and then send another; even if there was a notification that this happened, you could send that exceeding message while that notification was making its way to you. You can’t rely on a moderator’s limit unless you completely trust the channel owner(s).
Another point to make is that (and I’m speaking from years of experience running a large multi-channel moderation bot) there have been very few cases where more than 50 per 30 sec was justified for a single channel. Outside of tournament channels, you’re rarely going to find a channel exceed 60 messages per 30 sec from other chatters combined.
Point is (for known bots): if you’re a single channel bot, just stick to the 50/30; you don’t want the bot to even be able to take over the chat. If you’re a multi-channel bot, you have to stick to the 50/30 to stay safe.